Mounting for false teeth



Feb. 12 1924.

A. H. CHURCHILL MOUNTING F OR FALSE TEETH Filed Jan. 31 1920 I 3 Sheets-Sheet 1 [/2 rave in alga/Z10: )72'22 A. H. CHURCHlLL MOUNTING FOR FALSE TEETH Feb. l2 1924.

Filed 31 1920 3 Sheecs-JSheer. 2

ZECQarcZZZ Feb. 12. 1624. 1,483,781

A. H. CHURCHILL MOUNTING FOR FALSE TEETH Filed Jan. 51. 1920 3 Sheets-Sheet 5 Patented Feb. 12, 1924.

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ARTHUR H. CHURCHILL, or YARMOUTH, Nova scorn, CANADA.

MOUNTING ro'ja FALSE TEETH.

Application filedil'anuary 31, 1920. Serial No; 35591 70.

invented certain new and useful Improvements in Mountings for False Teeth; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others-skilled in theart to which it app'ertainsto make and use the same. i

This invention relates tocertain new and useful improvements in a mounting for false teethand has forits primary object'the provision of a form of mounting includinga combination of locking features and a pro tectingcusp or tip for protecting the grindingsurfaceof the tooth and "which features may '--be incorporated in various forms of mountings.

Another'object of the invention resides in the provision of a form of mounting for false teeth which will securely hold the F various teeth "-in position andrelieve the same of unnecessary strain and wear. I

A "further "ob ect of the invention IQSldQS in T the 'provlsion of a false 'to0th"moun-t1ng of the above stated character including a tenon carried by the backing andti to be cemented in a mortise in the porcelain or otherfacing of the false tooth.

A further object of the invention resides in theprovision of the fal'se'teethmounting including the securing means for the porcelain facing and the protecting means for the grinding or biting edge of the'falseteeth constructed and arranged in such manner that the feature maybe incorporated in'the structure in each toothof bridge worksupporting either anterior teeth or posterior teeth; j l

A further object of this invention resides in theprovision of a mounting for false teethjin which a rigid supporting bridge may be provided for'the interchangeable teeth and the various partsare seoured' together sothat theteeth will not be weakened although they may be readily fitted or replaced an'd When in position the strain will be taken on of the porcelain and the latter protected from strain when occluding with the opposite teeth. y

A 'still further object of the "invention resides in the'provision of false tooth mounting of the above stated character inwhich themanner of the engaging ofthe porcelain facing with the backing and its tiporcusp, as the case maybe, makes thisstyleo'ftooth simple and easy'to manipulate.

Othero'bje'cts of the invention will appear as the description proceeds and it will be understood that the invention consists in the combination, arrangement and cooperation of elements'as hereinafter more specifically set forth, claimed and shown in the accompanyingdrawings forming a part of this application and in which l Figure "MS a front elevation of a posterior bridge complete, ready for cementing to abutments, showing a cuspid "Richmond crown and a gold 'shell crown for abutments, with two bi-cuspid facings and a mola'r facin-g, one ofthe bi-cuspid 'facings being removed. I

FigureQ. is a detail -rear elev-ation "of the bi-cuspid facings removed from the bridge structure shown in Figure -1.

Figure 3 is a plan view of the bridge structure-as shownin Figure 1.

Figure 4 is a detail vertical transverse section'on the'plane of hue 4- lof Fig ure" 3. F1gure'5 1s a s1m1lar"v1ewonthe plane'of line 5-5 of Figure 3. i

Figure 6 is a similar view of the plane of line 6-6 of Figure 8.

Figure 7 is a detaillongitudinal section on the plane ofline 77 ofFigure 'L Figure 8 is a perspective view of an anterior bridge complete with three 'facin'g's, two of which have been removed.

Figures Sand lOare' detailviews'of the' two facings removed from the bridge structure shown in Figure 8.

Figure 1.1 isa perspectiveview of aporcelain facing (for'ante'rior) incisormounted.

on the goldb'acki'ng'provided forthe same.

Figure 12 is adetail of the facing removed. p a Figure 13 is a detail of the'backing-employed for the facing shown inFigure 12. Figure 14:Sl1 OWS the mountingo'f'a' bicuspid. r

Figure 15 is a detail of the porcelain facing removed.

Figure 1c isa detail'of the backing shown in Figure l l and carrying the tenon and cusp.

molar mounting.

Figure 17 is a perspective view of a Figure 18 is a detail view of the porcelain facing of the structure shown in Figure 17, removed.

Figure 19 is a detail view of the backing shown in Figure 17 and carrying the tenon and cusp.

Figure 20 is an enlarged detail section showing the mortise and tenon connection between the backing and facing of one of the teeth.

Referring more in detail to the drawings, in whichsimilar reference characters designate corresponding parts throughout the several views, the letter A designates a postcrior bridge, which is shown clearly in Figures 1 and 3 and which includes vfour false teeth and a crown, as will be seen by referring to the drawings, the first tooth, designated by the numeral 1, being a cuspid Richmond crown, the next two teeth, designated by the numerals 2 and 3, being bicupids, the next, designated by the numeral at, being a molar, next to which is formed the shell crown 5. Eachof the teeth 1, 2, 3

and 4 has a dovetailed mortise G'formed in l the. inner or rear side of the porcelain facing 7 to receive a dovetailed tenon 8 projecting from the receiving side of the back ing 9 provided for the porcelain facing 7. Formed with each back 9 is a cusp 10 which extends around and completely covers the grinding surface of the porcelain facing of the false tooth to protect the same and also cooperate with the tenon 8 and securely holding the facing 7' in rigid position and relieving the facing 7 of stress and protecting the same from strain when the false teeth are occluding with the opposite teeth in the wearers mouth. The cuspid and bicuspids' have their facings 7 secured upon the backings 9 by vertical elongated tenons 8 while the molar facing 7 is retained in position upon the backing 9 provided for the same by means of a horizontal elongated tenon 8, as will be clear from the sectional views throughthese teeth and the posterior bridge. It is also understood thatthe facings 7 are cemented in position, as indicated by the numeral 11 and the bridge, constructed of gold or some other suitable material,

is moulded into proper shape to form all,

the backings, crowns and cusps in one piece.

The anterior bridge B, shown clearly in Figure 8, includes a Richmond crown 12, a gold shell crown 18 and two backingslt carrying tenons 15 to receive porcelain facings 16 of anterior or incisor teeth, the porcelain facings 16 having dovetailed mortises 17 formed therein and within which may be cemented the dovetailed tenons 15. The Richmond crown 12 of this bridge also has a tenon 15 formed on the backing 14 thereof, for engagement in the mortise 17 of the porcelain facing 16 for By referring to Figures 11 to 13 inclu sive, the application of this invention to an (anterior) incisor tooth may be readily understood, the gold backing 19 carrying thevertical elongated dovetailed tenon 20 upon its front or outer side and having formed on its lower face the tip 21 for engagement over the biting edge 22-01 the porcelain facing 23, which latter has a dovetailed mortise 24L formed in its rear side to receive the tenon 20 as the porcelain facing 23 is cemented upon the backing 19.

In Figures 14 to 16} inclusive, the application of the invention to a bi-cuspid is disclosed. As shown, the gold back-ing 25 carries the vertically elongated tenon 26 upon'its front side and has its lower edge turned and formed for engagement over the grinding surface of the porcelain facing 28, its portion of the backing 25v serving as a cusp -27 to protect the grinding surface of the facing 28, a complete grinding face 29 being also formed with the backing 25 in this case. The bi-cuspid'facing 28 is provided with a vertically elongated mortise 30 to receive the tenon; 26 as the facing 28 is cemented in position.

In Figures 17 to 19 inclusive, I have shown the application of the invention to a molar tooth, in which the backing 31,has a transversely elongated tenon 32 formed on its front side for engagement in a cone spondingly formed mortise 38 in the rear side of the porcelain facing 21 as the latter is cemented in position upon the backing 31. This backing 31 includes a properly shaped extending edge portion to provide acusp 35 for engagement over the grinding surface.

of the porcelain facing 34. In this mounting the cusp 35 forms practically a continuationof the grinding face 36 carried by the backing 31. o

By a careful study of the foregoing in connection with the accompanying drawings, it will be apparent that the same principle of the cooperating tenon and mortise vconnections between the backing and facing and the cusp surrounding and protecting the bitingor grinding edge of the facing and assistlng in retaining the latter in proper position and relieving the same of stress or strain when the false tooth is occluding with the opposite tooth in the wearers mouth may be applied to various forms of mountings for false teeth either when mounting single teeth or when including several false teeth on a bridge.

While various forms or applications of the principle involved in this invention have been disclosed herein, it will be understood that I do not desire to limit myself to the details shown and described, as various improvements may be resorted to Within the scope of What is claimed without departing from the spirit of the invention.

What is claimed is 1. A false tooth mounting consisting of a.

backing, a. facing having its masticating edge in contact with the backing for reinforcement thereby, a tenon on the backing above and out of contact with said edge, said facing being applicable to the backing and the 'tenon to the facing by movement sub undue weakening of the facing particularly at said masticating edge.

2. A false tooth mounting having a backing provided with a rearwardly extending cusp, a portion extending upwardly and inwardly from the cusp and being out of contact with the cusp at the rear of the. portion, an upstanding portion rising from the inner extremity of the first portion, the upstanding portion being substantially in a plane passing through the cusp at a distance from the front edge thereof, a facing applicable against the upstanding portion by lateral movement and having its lower edge in intimate contact with the upper surface of the firstportion, a securing tenon on the upstanding portion, the facing having a mortise adapted to be entered by the facing through said movement, and the facing being substantially unbroken about the mortise.

In testimony whereof I afiix my signature in presence of two witnesses.

ARTHUR H. CHURCHILL.

Witnesses:

G. W. SAULNIER, BEL W. TREFRY. 

